Carl wrote:

You can turn up the volume of your phone to control the volume of your Argus 2 camera. And please make sure you've enabled the two-way audio correctly, you can refer to enable Two-way Audio via Reolink App to check it.
If the person outside still can't hear the person inside, please take a video and send an email to the support@reolink.com. We will check it for you soon. Thanks.

I have enabled two-way audio as per the directions on that page and tried turning the volume to the max on my phone, but the volume from the speaker on the camera is far too low. I honestly don't understand how adjusting the volume on my phone is supposed to affect the camera, but I tried it anyways.

I know the speaker is capable of going much louder because the voice prompts during setup were plenty loud. However, indoors in complete silence, I can barely make out a voice unless the person is yelling into their phone.

That is beyond unacceptable. I don't understand why there isn't just a simple volume slider in the app to control the volume of the speaker.

An option such as this would be very beneficial because when the camera is used outdoors there is background noise from nature or cars passing by, so it would be great to have it at max volume. While indoors you could use a quieter volume if you wanted.

You may have misunderstood what I mean. I mean you can turn up the volume of your phone to adjust the sound you heard on your phone side. If you can't hear the sound comes from the camera side on your phone clearly, you can turn up the phone volume to adjust. But the volume of the camera side can't be controlled at present. I know it is unreasonable, now we are working on this. Sorry for the inconvenience, we will fix this problem as soon as possible. Thank you for your understanding and patience.